Calculator casing



FIG. 1 is a view in perspective of a calculator casing showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top elevational view thereof;

FIG. 4 is a plan view thereof; and

FIG. 5 is a bottom elevational view thereof.

The rear side of the calculator casing is plain. 

The ornamental design for a calculator casing, substantially as shown and described. 